Portable fire extinguishing apparatus

ABSTRACT

A portable fire extinguishing apparatus, which comprises a casing ( 20 ) and a cartridge ( 3 ) arranged inside the casing ( 20 ). The top end of the cartridge ( 3 ) is fixedly connected with the casing ( 20 ) through a snap ring ( 24 ); the bottom of the cartridge ( 3 ) is fixedly connected with the casing ( 20 ) through some nuts and bolts; and an explosion venting unit ( 2 ) is arranged at the jet end of the cartridge ( 3 ). Kinetic energy generated from explosion is consumed through shifting and limiting processes of the explosion venting units ( 2 ), therefore recoil force or forward impact force generated after explosion of explosives can be consumed or released, so that safe and effective explosion venting is achieved and hurt to human bodies or articles after explosion of grains is avoided.

TECHNICAL FIELD OF THE INVENTION

The invention belongs to the field of fire prevention technology, andparticularly relating to a portable fire extinguishing apparatus.

BACKGROUND OF THE INVENTION

At present, existing portable fire extinguishing apparatuses aregenerally divided into pressure-storage dry powder fire extinguishingapparatuses and handheld aerosol fire extinguishing apparatuses, whereina pressure-storage dry powder fire extinguishing apparatus mainly havethe following disadvantages: firstly, the pressure-storage dry powderfire extinguishing apparatus causes serious pollution to the environmentand serious damage to materials; secondly, the pressure-storage drypowder fire extinguishing apparatus, which needs to store high pressuregases, is large in volume and heavy in weight; thirdly, thepressure-storage dry powder fire extinguishing apparatus, which is ahigh pressure container, has potential safety hazards and is moredangerous in a high temperature environment of a fire; fourthly, thepressure-storage dry powder fire extinguishing apparatus, which needs togo through regular surveillance tests and inspections, is high inroutine maintenance costs etc. By contrast, a portable aerosol fireextinguishing apparatus has obvious advantages and mainly comprises: acartridge, a cartridge cover arranged on the cartridge, and apyrotechnic composition, an ignition head, a coolant and a ceramic chipetc. arranged in the cartridge in turn and coated by a heat insulationmaterial. Normally, after the pyrotechnic composition is ignited by theignition head, a great deal of aerosol smog will be generated by thecartridge through rapid stratified combustion, and after being cooled bya coolant layer, these high temperature aerosols will be ejected fromthe cartridge cover of the cartridge to act on a fire source directly,thus extinguishing the fire. However, there are also some disadvantages.A coating defect, a pyrotechnic composition crack or a serious blockageof a gas channel may lead to a sudden rise of the pressure in thecartridge to deflagrate the cartridge. As a result, a high pressure gaswill thrust the cartridge cover of the cartridge forwards and will bevented rapidly to cast the cartridge cover of the cartridge and othersubstances in the cartridge forwards at an extremely high speed, thuscausing a very large recoil force. The powerful recoil force drives thecartridge cover to move backwards rapidly, which is easy to cause aninjury to an operator. At the same time, after explosion venting, thecartridge cover of the inner cartridge of the extinguishing apparatuswill also break away from the cartridge and fly outwards for arelatively long distance, which may cause other accidents. In addition,the cartridge of the extinguishing apparatus is easily loosened in acasing and the problem of fixation of the cartridge is a subject to besolved.

SUMMARY OF THE INVENTION

To solve disadvantages existing in a portable fire extinguishingapparatus in the prior art, the invention provides a portable fireextinguishing apparatus provided with an explosion prevention facilityand capable of effectively preventing explosion, releasing pressure andreducing a recoil force after deflagration.

The technical solution applied by the invention to solve the technicalproblem above is:

a portable fire extinguishing apparatus, comprising: a casing (20) and acartridge (3) arranged inside the casing (20), wherein the top end ofthe cartridge (3) is fixedly connected with the casing (20) through asnap ring (24); the bottom of the cartridge (3) is fixedly connectedwith the casing (20) through nuts and bolts, thus facilitatinginstallation on one hand, and the cartridge is well secured in thecasing at two sides so that the cartridge is not easily rotated orloosened on the other hand.

An explosion venting device (2) is further arranged at the jet end ofthe cartridge (3) of the fire extinguishing apparatus of the inventionto effectively prevent explosion and release pressure, reduce a recoilforce acting on the cartridge (3) after deflagration and prevent acartridge cover (4) of the cartridge (3) from flying outwards; theexplosion venting device (2) mainly comprises a frictional layer (11), aconnection rod (12), a connection rod guiding unit (13) and a connectionrod limiting device (14), wherein the connection rod (12) is connectedwith the cartridge cover (4) of the cartridge (3); the frictional layer(11) is arranged between the connection rod (12) and an outer wall ofthe cartridge (3); the frictional layer (11) provides a frictionalresistance and a buffering force for the connection rod (12) when thesame is guided by the connection rod guiding unit (13) to displace alonga direction towards which a hot air stream of the cartridge (3) isejected; the connection rod guiding unit (13) is a device capable ofproviding a guiding function for the connection rod (12) when the sameis moving; the connection rod limiting device (14) is a device capableof limiting the connection rod (12) when an extremity of the samereaches an spout of the cartridge (3). Powerful kinetic energy generatedafter deflagration of a grain is converted into deformation energy andovercoming resistance etc. through frictional acting and energyconversion and is dispersed or consumed, thus effectively releasing thepressure and reducing the recoil force.

The connection rod guiding unit (13) may be a guiding ring (15) fixedlyconnected with the connection rod (12) or a guiding groove provided onthe outer wall of the cartridge (3) and capable of enabling theconnection rod (12) to slide axially along the guiding groove; at thesame time, the connection rod limiting device (14) comprises a flanging(16) fixedly connected with the jet end of the cartridge (3) and aclamping claw (17) for fixing the connection rod (12); in addition, anelastic body (18) may be further arranged between the flanging (16) andthe connection rod guiding unit (13) or is arranged on a side face ofthe flanging (16).

A plurality of cartridges (3) may be arranged in the casing (20) of theinvention, and the bottoms of the cartridges (3) are fixedly connectedwith the casing (20) through bolts and nuts, thus the cartridges (3) canbe fixed by aligning the bottoms of the cartridges (3) with screw holesof the casing (20) and tightening the nuts so as to prevent thecartridges (3) from rotating in the casing (20).

The snap ring (24) may be composed of two half snap rings matched witheach other so as to fixedly connect the cartridge (3) and the casing(20).

The casing (20) of the invention is prism-shaped and made of an aluminummaterial, thus reducing cost and achieving a good cooling effect.

The bottom end of the casing (20) of the invention is further providedwith a bent handlebar (23); piezoelectric ceramics and a safety pin arearranged in the bent handlebar (23); the safety pin is unlocked througha pull ring arranged out of the bent handlebar (23); the bent handlebar(23) may be further provided as a telescopic bent handlebar, which isconvenient to start and operate.

The portable fire extinguishing apparatus of the invention mainly hasthe following advantages:

1. the cartridge of the invention is fixed in the casing through thebolts and nuts at the bottom and the snap ring at the top, which on theone hand facilitates installation, and on the other hand allows thecartridge to be fixed appropriately within the casing, thus not easilyrotated or loosened, also, obviated is the need for a production sitethat is required while waiting for silicone solidification by leaving tostand for seven to eight hours when silicone injection for fixing isused, thus improving production efficiency;

2. the fire extinguishing apparatus of the invention is provided withthe explosion venting device on the cartridge, thus consuming orreducing a recoil force or a forward impact force generated bydeflagration of an explosive to vent explosion safely and effectivelyand avoid injuries and damages caused after deflagration of the grainmainly through consuming kinetic energy generated by the deflagration ina shifting and limiting process of the explosion venting device;

3. the connection rod and the cartridge cover of the cartridge of theinvention are connected and apply a structure of a flanging and aclamping claw, thus effectively controlling a motion of the connectionrod, and the structure can effectively prevent a powerful impact forcefrom acting on the cartridge cover of the cartridge to thrust thecartridge cover apart from the cartridge, thus preventing accidentalinjuries caused after the cartridge cover flies outwards;

4. the invention is started by piezoelectric ceramics, thus avoidingreplacement of batteries and routine maintenance and saving maintenancecosts.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural diagram of a fire extinguishing apparatus of theinvention;

FIG. 2 is a structural diagram of a cartridge of the invention;

FIG. 3 is a sectional view of a structure of a cartridge of theinvention; and

FIG. 4 is a partial structural diagram of a fire extinguishing apparatusof the invention (bottom cover not shown).

In the drawings: 1—fire extinguishing apparatus, 2—explosion ventingdevice, 3—cartridge, 4—cartridge cover, 5—ceramic cellular coolinglayer, 6—coolant, 7—grain, 8—ignition head, 9—sealing ring, 10—rubberplug, 11—frictional layer, 12—connection rod, 13—connection rod guidingunit, 14—connection rod limiting device, 15—guiding ring, 16—flanging,17—clamping claw, 18—elastic body, 19—heat insulation layer, 20—casing,21—bottom cover, 22—top cover, 23—bent handlebar, 24—clamping ring.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The invention provides a portable fire extinguishing apparatus andpreferred embodiments of the invention will be further described incombination with the accompanying drawings:

Referring to FIG. 1, the fire extinguishing apparatus 1 is mainlycomposed of a casing 20, a bottom cover 21 and a top cover 21 of thecasing 20, a cartridge 3, a cartridge cover 4 of the cartridge, anexplosion venting device 2 and a bent handlebar 23, wherein the casing20 is prism-shaped and made of an extruded aluminium material, thusachieving a good cooling effect; the top cover 22 and the bottom cover21 of the casing 20 are matched with the casing 20, and the lower endsof the top cover and the bottom cover extend into the casing 20respectively; the bottom of the cartridge 3 of the invention is lockedon the bottom cover 21 of the casing 20 through bolts and nuts, and thetop of the cartridge is clamped through a snap ring 24 consisting of twohalf snap rings and is matched with the top cover 22 of the casing 20,so that the cartridge 3 is tightly locked and fixed at the top and thebottom, thus preventing the cartridge from oscillating or rotating inthe casing 20; in assembly, the top of the cartridge 3 is clamped by thetwo half snap rings to clamp the cartridge right in a correspondinginstallation hole of the top cover 22, i.e. the top of the cartridge 3is pressed on one half snap ring while the other half snap ring ispressed into the top cover 22 subsequently; the top cover 22 is thenpressed into the aluminum casing 20; then the bottom cover 21 isinstalled and the bottom of the cartridge 3 is locked and attached withthe bottom cover 21 to complete assembly of the cartridge 3. A pluralityof cartridges 3 may be arranged in the casing 20, preferably three.

Referring to FIG. 2 and FIG. 3, the cartridge cover 4 of the cartridgemay be further arranged on the top end of the cartridge 3 of theinvention; a ceramic cellular cooling layer 5, a coolant 6, a grain 7and an ignition head 8 arranged on the section of the front end of thegrain 7 are arranged in the cartridge 3 in turn; generally, thecartridge 3 and the cartridge cover 4 of the cartridge are connectedhermetically through a sealing ring 9, wherein the section of thesealing ring 9 may be square, circular or in other shapes; the cartridgecover 4 of the cartridge comprises a spout and a trumpet nozzle, and thecenter of the spout faces the center of the trumpet nozzle; the spoutmay be sealed by a rubber plug 10 or an aluminium foil; in addition, theceramic cellular cooling layer 5 can fix the coolant 6 to prevent thecoolant from dropping out on one hand, and have a physical coolingeffect to reduce the temperature of a high temperature hot aerosol onthe other hand; generally, the ceramic cellular cooling layer 5 may bearranged at the front end of the coolant 6, may be also provided in themiddle of the coolant 6, or may be also provided at both the front endand the middle section of the coolant 6, and the positions and quantityof ceramic cellular cooling layers are determined according to actualapplication conditions; one end of the trumpet nozzle having arelatively large diameter of the invention is connected with thecellular cooling layer, thus guiding an aerosol to be ejected from thespout, and the trumpet nozzle may be integrated with the cartridgecover; a heat insulation layer 19 may be further added between the grain7 and the inner wall of the cartridge 3 to have a heat insulation effectand prevent people or materials from being burnt by heat generated afterignition of the aerosol.

The explosion venting device 2 of the invention mainly comprises africtional layer 11, a connection rod 12, a connection rod guiding unit13, a connection rod limiting device 14 and an elastic body 18, whereinthe connection rod 12 is connected on the cartridge cover 4 of thecartridge, and may be fixedly connected through welding and rivet jointetc., or may be also integrated directly, thus the structural strengthis higher; the frictional layer 11 may be one or more rubber rings orsilicone layers or other materials capable of providing enoughfrictional resistance for axial sliding of the connection rod 12; thefrictional layer 11 may be arranged between the connection rod 12 andthe cartridge 3, or may be directly fixed at an inner side of theconnection rod 12; the frictional layer 11 provides a frictionalresistance and a buffering force for the connection rod 12 when the sameis guided by the connection rod guiding unit 13 to displace along anaxial direction of the cartridge 3; the connection rod guiding unit 13is a device capable of providing a guiding function for the connectionrod 12 when the same is moving, and may be a guiding ring 15 fixedlyconnected with the connection rod 12, or may be also a guiding grooveprovided on the outer wall of the cartridge 3 and capable of enablingthe connection rod 12 to slide along the guiding groove, or otherstructures having a guiding function; this guiding structure can preventthe connection rod 12 from being offset or locked during a movingprocess of the cartridge 3; when the guiding ring 15 is applied toguiding, the guiding ring 15 may be fixedly connected with an extremityof the connection rod 12 or directly integrated with the connection rod12; the connection rod limiting device 14 of the invention is fixedlyconnected with the cartridge cover 4 of the cartridge and the connectionrod 12; when the extremity of the connection rod 12 reaches a positionas illustrated of the cartridge cover 4 of the cartridge, the connectionrod is limited by the connection rod limiting device 14; the connectionrod limiting device 14 mainly comprises a flanging 16 and a clampingclaw 17, wherein the flanging 16 and the cartridge 3 are fixedlyconnected, or may be also integrated directly, and one end of theclamping claw 17 is fixed on the connection rod 12 while the other endis clamped with the cartridge 3 to mainly fix the connection rod 12; theconnection rod 12 may be also integrated with the clamping claw 17, orthe connection rod limiting device 14 of the invention may be also otherstructures, as long as the connection rod 12 can be fixed on one hand,and the connection rod 12 can be blocked and prevented from beingdetached from the cartridge 3 on the other hand. The elastic body 18 maybe further arranged between the flanging 16 of the invention and theconnection rod guiding unit 13, or may be arranged on a side face of theflanging 16 to mainly buffer a collision force between the extremity ofthe connection rod 12 and the cartridge 3 or between the extremity ofthe connection rod 12 and the flanging 16, prolong collision time andrelease, by using the elastic property of the elastic body, a part ofkinetic energy generated after deflagration.

The displacement of the connection rod 12 of the invention is preferablycontrolled within 50 to 60 mm, because excessive displacement will failto reduce a recoil force; however, the kinetic energy cannot be consumedthoroughly by little displacement, and the cartridge cover of thecartridge is very likely to get rid of the blockage of the connectionrod limiting device (14); once the cartridge cover of the cartridge isseparated from the cartridge, a powerful recoil force will be generated;however, the displacement of the connection rod 12 may be adjustedappropriately according to a specific application environment, as longas an optimal explosion venting effect can be realized.

When the gain 7 of an inner cartridge is ignited and released normally,hot air is released from the spout of the cartridge cover 4 of thecartridge, and an oversize air stream will not be generated, thus theexplosion venting device 2 will not be started; the connection rod 12,which is fixed on the cartridge 3 by the clamping claw 17, will not moveto generate displacement along an axial direction of the cartridge 3;only when the cartridge cover 4 of the cartridge and the connection rod12 are pushed by a powerful hot air stream generated by unexpectedexplosive deflagration to move in a direction towards which the hot airstream is ejected, the clamping claw 17 of the connection rod limitingdevice 14 slips under the action of a powerful impact force on one handto consume a part of the impact kinetic energy; pushed by the hot airstream, the connection rod 12 drives the guiding ring 15 to slideaxially along the outer wall of the cartridge 3 to generatedisplacement, and the frictional layer 11 generates frictionalresistance to the connection rod during the moving process to consume apart of the impact kinetic energy; when the extremity of the connectionrod 12 reaches the spout of the cartridge 3, the flanging 16 of theconnection rod limiting device 14 fixed on the cartridge 3 stops theextremity of the connection rod 12 from being separated from thecartridge 3; at the moment, the elastic body 18 arranged between theflanging 16 and the guiding ring 15 functions to consume a part of theimpact kinetic energy with its elasticity, and buffers the powerfulimpact force between the extremity of the connection rod 12 and theflanging 16 additionally; when the final kinetic energy acts on theflanging 16 in the form of collision, the flanging 16 is deformedelastically or plastically, which will consume all remaining kineticenergy; thus the powerful impact kinetic energy generated bydeflagration of the grain 7 may be well consumed or dispersed in thewhole process to avoid injuries or damages brought thereby.

A bent handlebar 23 extending out of the casing 20 is further providedat the bottom of the casing 20 of the invention, wherein a PC elasticsheet, piezoelectric ceramics and a safety pin are arranged in the benthandlebar 23; the safety pin is unlocked through a pull ring providedoutside the bent handlebar 23; a starting push button may be arranged ona position that facilitates operation out of the bent handlebar 23, andmay be started when pressed. A fixing cover is further arranged outsidethe bottom cover 21 of the casing 20 to fix the bent handlebar 23 on thebottom cover 21 through five bolts; the bent handlebar may be furtherprovided as a telescopic bent handlebar which is pulled out in use andmay be retracted when not in use, thus saving space. In use, the pullring is pulled out to unlock the safety pin, and the press button ispressed to start the fire ignition head 8 of the fire extinguishingapparatus 1 through the piezoelectric ceramics, thus starting the fireextinguishing apparatus 1.

In the FIG. 4, a reference number 27 shows the feature “bolts”, areference number 28 shows the feature “nuts”, a reference number 25shows the feature “piezoelectric ceramics”, a reference number 26 showsthe feature “safety pin”, a reference number 23 shows the feature “thetelescopic bent handlebar”.

The invention claimed is:
 1. A portable fire extinguishing apparatus,comprising a casing (20) and a cartridge (3) arranged inside the casing(20), a top end of the cartridge (3) is fixedly connected with thecasing (20) through a snap ring (24); a bottom of the cartridge (3) isfixedly connected with the casing (20); wherein an explosion ventingdevice (2) is arranged at a jet end of the cartridge (3); the explosionventing device (2) comprises a frictional layer (11), a connection rod(12), a connection rod guiding unit (13) and a connection rod limitingdevice (14); the connection rod (12) is connected with a cartridge cover(4) of the cartridge (3); the frictional layer (11) is arranged betweenthe connection rod (12) and an outer wall of the cartridge (3); thefrictional layer (11) provides a frictional resistance and a bufferingforce for the connection rod (12) when the same is guided by theconnection rod guiding unit (13) to displace along a direction towardswhich a hot air stream of the cartridge (3) is ejected; the connectionrod guiding unit (13) is a device capable of providing a guidingfunction for the connection rod (12) when the same is moving; theconnection rod limiting device (14) is a device capable of limiting theconnection rod (12) when an extremity of the same reaches an spout ofthe cartridge (3).
 2. The portable fire extinguishing apparatusaccording to claim 1, wherein the connection rod guiding unit (13) is aguiding ring (15) fixedly connected with the connection rod (12) or aguiding groove provided on the outer wall of the cartridge (3) andcapable of enabling the connection rod (12) to slide axially along theguiding groove; the connection rod limiting device (14) comprises aflanging (16) fixedly connected with the jet end of the cartridge (3)and a clamping claw (17) for fixing the connection rod (12); an elasticbody (18) is arranged between the flanging (16) and the connection rodguiding unit (13) or is arranged on a side face of the flanging (16). 3.The portable fire extinguishing apparatus according to claim 1, whereina plurality of cartridges (3) are arranged in the casing (20).
 4. Theportable fire extinguishing apparatus according to claim 1, wherein thecasing (20) is prism-shaped and made of an aluminum material.
 5. Theportable fire extinguishing apparatus according to claim 4, wherein abottom end of the casing (20) is further provided with a bent handlebar(23).
 6. The portable fire extinguishing apparatus according to claim 5,wherein the bent handlebar (23) is telescopic.
 7. The portable fireextinguishing apparatus according to claim 1, wherein the casing (20) isprism-shaped and made of an aluminum material.
 8. The portable fireextinguishing apparatus according to claim 2, wherein the casing (20) isprism-shaped and made of an aluminum material.
 9. The portable fireextinguishing apparatus according to claim 3, wherein the casing (20) isprism-shaped and made of an aluminum material.
 10. The portable fireextinguishing apparatus according to claim 1, wherein the casing (20) isprism-shaped and made of an aluminum material.